Reduced-size microstrip four-pole bandpass filter using two-layer structure with quarter-wavelength resonators and open stub inverters

Azzeddine Djaiz (1) , Tayeb Denidni (1) , Halim Boutayeb (1, 2)

1 EMT-INRS - Énergie Matériaux Télécommunications - INRS
2 EPM - École Polytechnique de Montréal

A new miniature microstrip four-pole bandpass filter using a two-layer structure with quarter-wavelength resonators and open stub inverters is proposed. The coupling between the resonators in the two layers is achieved via a slot etched on a common ground plane located between the layers. The open stub inverters are used to increase the selectivity of the filter and to avoid connection to ground plane that is generally required for quarter-wavelength resonators of bandpass filter. A four-pole bandpass filter with elliptic-type performance is designed and tested at 2.45 GHz.

Mots clés: Compact Filter

Domaines: Electromagnétisme

Azzeddine Djaiz, Tayeb Denidni, Halim Boutayeb. Reduced-size microstrip four-pole bandpass filter using two-layer structure with quarter-wavelength resonators and open stub inverters. Microwave and Optical Technology Letters, 2008, pp.vol. 50, no. 6, 1485-1487. ⟨10.1002/mop.23401⟩. ⟨hal-00267955⟩